Year	% of total
1970	1.052481808052059
1971	1.0818329422278967
1972	1.186817020947452
1973	1.2362831088215076
1974	1.57295392447801
1975	1.4362917403750282
1976	1.3604062943653195
1977	1.2328951256367304
1978	1.341575170683527
1979	1.2221728370340608
1980	1.0539591246438098
1981	1.1775404718734939
1982	1.1102773441824998
1983	1.2875133447655795
1984	1.3877791973439102
1985	1.6027411978351682
1986	1.542815363939586
1987	1.5215793055157283
1988	1.6250266577045875
1989	1.5616542600136845
1990	0.96
1991	0.964630225080386
1992	0.9615384615384616
1993	0.9478672985781991
1994	0.9389671361502347
1995	0.9259259259259258
1996	1.308139534883721
1997	1.7118402282453637
1998	2.0107238605898123
1999	2.2249690976514214
2000	2.4271844660194173
2001	2.6957637997432604
2002	2.875
2003	2.92326431181486
2004	2.696871628910464
2005	2.7455121436114043
2006	2.7139874739039667
2007	2.6804123711340204
2008	2.5193798449612403