What does the change of colors of LEGO bricks tell us?

People with Brickset Forum took LEGO database, which lists all the LEGO boxes that went on sale from 1975 to 2015, by series, by year – there are different query systems, but it does not matter. The funny thing is that there are all the details of LEGO, of which consist of these sets. Every last one. So they created this graph that shows how the colors of the LEGO pieces in the sets have changed over the years. Here you look-the breakthrough comes in 1991 – the number of colors increases and continues to grow until now. After all, not only with LEGO flowers in 1991, something incredible began to happen-well, one Soviet Union is worth it. Maybe something like this happened to our world and now it has not stopped?..