Horse population

I asked below about when the horse population peaked, and I received an answer from weblog reader Miles.

Here are the US numbers:

1867 – 8,000,000
1915 – 21,500,000
1949 – 6,000,000
1950’s (early) - 2,000,000
1960 – 3 million

Today, there are an estimated 75,000,000 horses in the world. China leads the pack (herd?) with 10,000,000.