Year	% of total
1990	8.295196236051156
1991	8.427763657140813
1992	8.518639396259406
1993	8.644293960811055
1994	8.583428878577259
1995	8.965537295064738
1996	8.993343711484552
1997	9.305455468374427
1998	10.266072740879263
1999	10.247008203388672
2000	10.420303316172767
2001	10.418634180605046
2002	10.312359229964663
2003	10.626034615938993
2004	10.698745215227266
2005	11.013711160614
2006	11.572033330526953
2007	11.564766006962483
2008	12.275484523310402