Year	% of total
1990	8.017268514083263
1991	8.3030003432059
1992	8.78084151434959
1993	8.67384250927198
1994	8.832005058758876
1995	9.49861332330388
1996	9.440525512855189
1997	9.763401280632214
1998	9.856537555575024
1999	8.953030839317579
2000	9.06545817202656
2001	9.187423144167667
2002	9.927624714721054
2003	10.882004623627013
2004	10.673877707420644
2005	10.608000776095697
2006	10.125174871324184
2007	9.583223087720258
2008	9.911297370505597
2009	10.903969268655034
2010	11.426682304351072
2011	10.609266938662058
2012	9.182832271386784
2013	10.068891539547687
2014	8.938669713971308
2015	9.235029383033941
2016	9.066357370496489