Earlier this afternoon I checked the FBI's 2000 thru 2009 LEOKA stats. Except for 2009, the trend since 2000 is that the number of assaults on LEOs have increased. They were pretty much in the 57,000 - 61,000 assaults/year range. Given the LEO population was about 500,000 LEOS, that's slightly over 10-percent of all LEOS are assaulted each year.
See here for stats: http://www2.fbi.gov/ucr/killed/2009/data/table_70.html
jsandi, have you ever discusses this with anyone?