Paired board question

[Webster]

Last night and Bodog AND Absolute it seemed like there were a lot of paired boards on the flop.

What percentage of time SHOULD the board be paired????

IN 200 hands that I went through it happed 52 times. The board was paired 52 times on the flop!

I hit my set ONCE and had top boat on the turn . . . .and lost! Think I lost a lot of $$ on that one? YUP!