| 1978 | 1979 | 1980 | | 1981 | 1982 | 1983 | 1984 | 1985 | | 1986 | 1987 | 1988 | 1989 | 1990 | | 1991 | 1992 | 1993 | 1994 | 1995 | | 1996 | 1997 | 1998 | 1999 | 2000 | | 2001 | 2002 | 2003 | 2004 | 2005 | | 2006 | 2007 | 2008 | 2009 | | |
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| | | | | | | | | 90174 | 65943 | 28435 | 16085 | 29767 | 26432 | 3.35 | 1.89 | 3.11 | 97942 | 72131 | 31842 | 17398 | 30231 | 26808 | 3.66 | 1.87 | 3.08 | 102601 | 74753 | 34365 | 17492 | 32453 | 28495 | 3.88 | 1.97 | 3.22 | | | | | | | | | | 110774 | 81183 | 37886 | 20025 | 33666 | 29783 | 4.20 | 2.20 | 3.30 | 114420 | 83843 | 39385 | 20389 | 34574 | 30940 | 4.30 | 2.23 | 3.40 | 119222 | 86593 | 41216 | 21181 | 35987 | 32242 | 4.40 | 2.26 | 3.50 | 124664 | 89362 | 42112 | 22286 | 38580 | 34602 | 4.40 | 2.33 | 3.70 | 127771 | 90831 | 42216 | 23782 | 41603 | 38180 | 4.44 | 2.48 | 3.99 | | | | | | | | | | 132865 | 94433 | 43403 | 25383 | 43956 | 40903 | 4.47 | 3.72 | 4.21 | 142556 | 101829 | 46007 | 27786 | 47538 | 44407 | 4.66 | 2.81 | 4.49 | 145362 | 105237 | 48216 | 30250 | 53078 | 48711 | 4.82 | 3.02 | 4.87 | 150062 | 108108 | 49361 | 32056 | 55623 | 51877 | 4.83 | 3.14 | 5.08 | 156304 | 111614 | 50934 | 34565 | 59036 | 55474 | 4.93 | 3.35 | 5.37 | | | | | | | | | | 161103 | 114342 | 52309 | 35714 | 61744 | 58744 | 5.03 | 3.44 | 5.65 | 164213 | 115825 | 53254 | 36768 | 63230 | 59833 | 5.10 | 3.52 | 5.73 | 165170 | 116173 | 53906 | 36687 | 65621 | 62340 | 5.13 | 3.49 | 5.93 | 164867 | 116818 | 53865 | 36608 | 67112 | 64416 | 5.07 | 3.45 | 6.07 | 164436 | 115967 | 54114 | 36719 | 66925 | 64211 | 5.06 | 3.43 | 6.00 | | | | | | | | | | 164981 | 116849 | 54091 | 37712 | 66760 | 64902 | 5.02 | 3.50 | 6.02 | 167090 | 119256 | 54909 | 38630 | 67946 | 65826 | 5.06 | 3.56 | 6.06 | 162609 | 115976 | 51902 | 38883 | 69095 | 66954 | 4.76 | 3.56 | 6.13 | 161823 | 116597 | 52646 | 39625 | 69465 | 67684 | 4.79 | 3.60 | 6.15 | 160258 | 115510 | 51570 | 39900 | 71245 | 69183 | 4.66 | 3.60 | 6.25 | | | | | | | | | | 158185 | 115935 | 52100 | 40537 | 73053 | 70837 | 4.64 | 3.61 | 6.31 | 144021 | 109564 | 47236 | 38879 | 75188 | 71967 | 4.18 | 3.44 | 6.46 | 148406 | 112212 | 47887 | 39912 | 74298 | 71173 | 4.21 | 3.51 | 5.89 | 153154 | 116610 | 48988 | 41547 | 77359 | 73811 | 4.25 | 3.60 | 6.54 | 157133 | 119874 | 50617 | 42897 | 79067 | 76031 | 4.32 | 3.66 | 6.65 | | | | | | | | | | 166278 | 126904 | 52795 | 45647 | 81440 | 78588 | 4.44 | 3.84 | 6.77 | 182475 | 139275 | 54989 | 50890 | 83736 | 80158 | 4.53 | 4.19 | 6.34 | 193799 | 149916 | 58773 | 55349 | 86196 | 81937 | 4.78 | 4.50 | 6.43 | 208156 | 160435 | 62348 | 61604 | 90100 | 84896 | 5.00 | 4.94 | 6.62 | | | | | | | | | | | | | | | | | | | |