U.S. progress vs. shelter killing

From ANIMAL PEOPLE,  July/August 2008:



Year   Millions of   Killed per
        dogs & cats    1,000
          killed      Americans
-------------------------------
1950       2.0      13.5
1970      23.4     115.0
1985      17.8      74.8
1997       4.9      21.1
1998       4.9      19.4
1999       4.5      16.6
2000       4.5      16.8
2001       4.4      15.7
2002       4.2      15.3
2003       4.5      14.8
2004       4.9      17.4
2005       4.4      14.8
2006       4.0      13.6
2007       4.2      13.8