During the 1970s a number of agro-based industries developed, particularly, rice milling and warehousing, feed and seed production, the raising of pigs and chickens, slaughtering, gunny-sack manufacturing, and the freezing and canning of a variety of marine and agricultural products. In addition, there was considerable expansion and diversification of agro-processing, most of it involving sugar, corn, kenaf and cassava. Some of these developments reflected a relaxation of government control, for example, over sugar refining in 1969 and slaughtering in 1973 (Dixon 1999, 102). During this period the average annual growth rate of the agricultural sector dropped from 4.5 percent in the previous Plan period to about 4 percent. Migration from rural areas to the capital continued to be rapid (Warr and Bhanupong 1996, 72)