比较什么时候需要倒装？？

米娅丫丫

Britain's economic growth was slower in the mid-1970's and its decline much more rapid in the subsequent recession than the United States.

这个句子did就提前了

Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture to 1950.

这个比较没有倒装

很疑惑，求解答！！！