I need information for my speech,I can't find it any where on the web.Im hoping it will be on this website

You'll need to reduce the scope of your question as you have not included a general location and without which any answers you get will be meaningless.

Back in the 1990's in Broward County, Florida there were 150 different active gangs. By now it's probably tripled and then some.

What area are you inquiring about?

Such statistics are kept on a local level. So without a locality we can't guide you. You also need to identify what you mean by gangs.