Year	% of total
1990	7.1479457654370595
1991	7.4798680458597735
1992	7.770301757484132
1993	7.957055759512516
1994	6.473129167894971
1995	6.658579001525648
1996	6.854056300226215
1997	6.980338319482985
1998	6.953632328581971
1999	6.979520671914661
2000	7.192900057432484
2001	7.188719661878499
2002	6.912246368379007
2003	7.1065472526526365
2004	6.98727359056549
2005	6.91718276727071
2006	7.169224009439727
2007	7.253407851375816
2008	7.405636014596779