Here are the numbers comparing litigation cases filed in China vs. in the US (2014):

For patent cases, 9648 litigations were filed in China in 2014, compared to 6185 in the USA. China is roughly 2 times of USA

For trademark cases, 21362 litigations were filed in China in 2014, compared to 3201 in the USA. China is roughly 7 times of USA.

For copyright cases, 59493 litigations were filed in China in 2014, compared to 3796 in the USA. China is roughly 16 times of USA

Surprisingly, foreign related cases were roughly 26% of the overall cases.

The 2017 statistics are not yet entirely available.