1978 0.8979 0.4055 0.3931 1979 1.5065 1.0053 1.0234 1980 1.6789 1.9935 2.2880 1981 2.7484 3.3707 3.6867 1982 3.7131 5.0657 4.7145 1983 5.2408 6.7658 5.4286 1984 5.3454 7.6252 6.1357 1985 5.5817 8.5417 6.4665 1986 6.4374 9.5004 6.6406 1987 6.7762 10.8990 7.1670 1988 6.8331 12.8674 7.6567 1989 6.6672 14.1173 7.6636 1990 6.5550 16.1982 7.9032 1991 7.1605 18.1420 7.2192 1992 7.9012 22.0512 7.0550 1993 8.3573 24.1423 6.8356 1994 8.6977 26.3927 6.8557 1995 10.0133 30.3505 7.1471 1996 8.0918 31.8090 7.4470 1997 8.8617 32.4249 7.6683 1998 9.7116 33.8127 7.6380 1999 9.8504 35.9209 7.6441 2000 10.8763 37.8397 7.6294 2001 10.9735 39.1211 7.2245 2002 12.0145 40.4658 6.9269 2003 11.6023 40.9399 7.0766 2004 12.2601 43.4493 7.8094 2005 12.9778 44.3480 8.2822 2006 13.8128 45.5540 8.7431 2007 12.4816 41.0036 8.9682 2008 9.4090 35.9483 8.5824 2009 7.2974 30.7142 7.6661 2010 5.3461 27.9316 6.9656 2011 4.9761 26.2757 6.4161 2012 3.6018 24.4210 5.7026