Was the purpose of your post to compare 2 completely different statistics, or were you trying to make a comparison between the 36% and the 2%? If you were trying to make a comparison, you failed. One is the percent of professional athletes that came from their respective college sport, whereas the other is the percent of college athletes that make it professional in that sport. I realize these may sound similar, but take a couple seconds to think about it and you'll realize they aren't at all the same. If you want to compare MLB with the 36% statistic, you would need to look up the percent of MLB players that came from college baseball (which I'm assuming is significantly higher than 2%). Or, if you were trying to compare with the 2% statistic, you need to find the percentage of college hockey players that make it to the NHL, which I'm sure is significantly lower than the 36% (I doubt 36% of college hocky players make it to the NHL).
Read the stat again. They are completely unrelated.