1990 8086 9895 0.817
1991 8973 10921 0.822
1992 10573 11901 0.888
1993 11029 12885 0.856
1994 11932 14036 0.850
1995 12865 15115 0.851
1996 13376 16116 0.830
1997 13740 17116 0.803
1998 12546 17750 0.707
1999 13535 18937 0.715
2000 14641 20321 0.720
2001 13108 20325 0.645
2002 13370 21613 0.619
2003 13748 22769 0.604
2004 14986 24942 0.601
2005 16023 26657 0.601
2006 16451 28836 0.571
2007 17122 31261 0.548
2008 17372 31994 0.543
2009 16331 31544 0.518
2010 18488 35296 0.524
2011 20030 37396 0.536
2012 20386 38462 0.530
2013 20930 39767 0.526