Other policies have been important contributors to development in Costa Rica. In the early 1960s, Costa Rica shifted attention from import substitution to export promotion. This was a timely change: countries that made this shift in the early 1960s, notably South Korea and Taiwan, have had striking development success (see cases 2 and 15, and Todaro and Smith chapter 13). Costa Rica differs from those economies, however, in that its exports have been more concentrated in agriculture. The largest traditional crop is coffee, which together with bananas, meat, sugar, and cocoa comprised 70% of export earnings in the 1970s. Costa Rica has had some success in nontraditional agriculture, such as decorative yucca, however. Costa Rica also emphasized agricultural infrastructure and extension programs.