FOREIGN investment in the manufacturing sector has quadrupled in the past 10 years, the Government says. A survey showed year-on-year investment in the territory's industries, from clothing to electronics, grew 8 per cent to more than $44 billion last year. In 1984, the total was $11.4 billion. Director-General of Industry Regina Ip yesterday said: 'The increase was largely accounted for by the rise in stock of fixed assets.' The survey showed that Japan remained as the leading source of external investment, accounting for $14.7 billion or 34 per cent of the total. The United States was second, with $11.8 billion or 27 per cent. China provided $4.2 billion or 10 per cent while Britain was the source for $3 billion or 7 per cent. The survey said electronics, electrical products, textiles and clothing, and food and beverages industries accounted for about 60 per cent of the foreign investment. Mrs Ip said: 'External investment is important to Hong Kong not only because of the capital inflow, but also because it helps to introduce new or improved products, advanced technologies, innovative designs and management techniques to help local manufacturing industries remain competitive in the world market.' The Government said more than 2,000 foreign companies with regional operations were based in the territory at the end of May this year. Of these, 782 were regional headquarters and 1,286 were regional offices. This compared with 714 regional headquarters and 1,132 regional offices a year earlier. The US had the largest number of regional headquarters in Hong Kong, with 198 companies. Japan was next with 116 companies and Britain followed with 94. The major lines of business of these regional headquarters consisted of trading and distribution, manufacturing, finance and banking, and transport and related services. Japan, with 303, had the largest number of regional offices while the US had 228. The survey said trading and distribution were the most common economic activities pursued by regional offices, followed by finance and banking, manufacturing, and transport and related services. The Industry Department said manufacturing industries saw significant growth in terms of dollar value of gross output, productivity and investment. 'Hong Kong's manufacturing industries have maintained a high level of productivity,' Mrs Ip said. The report said gross output of manufacturing industries rose an average annual rate of 7.6 per cent to $311.81 billion in 1993, from $170.76 billion in 1983. Productivity, in terms of value added per person, was up 14.4 per cent during the same period. The manufacturing sector enjoyed the highest growth rate in productivity among the four major economic sectors in the decade to 1993. It was also higher than the growth rate of the economy as a whole, at 13.3 per cent. Investment in the manufacturing industries, in terms of gross additions to fixed assets, grew at an average annual rate of 8.1 per cent in the same period. Mrs Ip said: 'These statistics demonstrate the substantial amount of manufacturing activities in Hong Kong, and the continued importance of the manufacturing sector to our economy. 'But the contribution of the manufacturing sector is really much more if one takes into account the Hong Kong-owned factories in southern China and the businesses that they have brought to Hong Kong's manufacturing-support services sector.' Hong Kong had been shifting from the assembly of labour-intensive products to the manufacture of sophisticated, technology-intensive goods, she said.