FROM THE EXAMINER ARTICLE: "The current reality is that violent criminals are attacking and killing our police officers with a growing and brazen impunity."
I did a little research and apparently while they may be more brazen, the numbers have not increased.
I limited my review to the United States during my lifetime, 1960 - 2010 (2011 is not over yet so data is not complete, 31 to date)
The number of Law Enforcement Officers killed in the line of duty by gunfire in the 60s was similar to what it is in the 2000s. It rose sharply in the 70s and has
been declining pretty steadily through the 80s, 90s, and 2000s.
Source:
http://www.odmp.org/
This website has every single officer reported killed in the U.S. back to 1846.
1960 - 47
1961 - 57
1962 - 60
1963 - 61
1964 - 62
1965 - 63
1966 - 64
1967 - 86
1968 - 76
1969 - 100
1970 - 107
1971 - 141
1972 - 122
1973 - 142
1974 - 140
1975 - 144
1976 - 105
1977 - 96
1978 - 100
1979 - 112
1980 - 104
1981 - 93
1982 - 91
1983 - 81
1984 - 72
1985 - 76
1986 - 75
1987 - 75
1988 - 80
1989 - 69
1990 - 61
1991 - 73
1992 - 65
1993 - 77
1994 - 84
1995 - 70
1996 - 60
1997 - 68
1998 - 64
1999 - 44
2000 - 50
2001 - 65
2002 - 57
2003 - 48
2004 - 56
2005 - 53
2006 - 51
2007 - 66
2008 - 40
2009 - 47
2010 - 59