这几句英文对不对？

1 Several years ago, when we were only noticing the speed of the increasing in economic, we cerntainly did not know the Wall Street would bring such a big crisis to us.

2 the number of the tourists has decreased by 15 percent, with the income of tourism dropping down seriously.

3 We think countries in Latin America should come together to negotiate with the EU in exports and imports, to vindicate our vested interests.

4 we raised the housing fund of non-tenant to 5 million dollars

---------------------------------------------------------------
改了下语法错误,但是似乎并不怎么地道

1 Several years ago, when we were only noticing the speed of the increase in economy, we surely didn't know the Wall Street would bring such a big crisis to us.
2 the number of tourists has decreased by 15 percent, with the income of tourism dropping seriously.
3 We think countries in Latin America should come together to negotiate with