Year	% of total
1990	9.522894232185552
1991	9.658126235747607
1992	9.357070127350706
1993	9.745353432782766
1994	9.719368439306338
1995	10.174632968989753
1996	9.851627519643145
1997	9.343345063106627
1998	8.89950811496381
1999	8.83194183410804
2000	8.974444339604885
2001	9.28767207325605
2002	9.55633627069343
2003	10.857124813876426
2004	9.913814545909169
2005	10.571404059810858
2006	10.451152422735422
2007	9.84139097089714
2008	9.41854009139117
2009	8.704498379970305
2010	10.310134485733984
2011	10.83171010495124
2012	9.778633704867683
2013	10.15799420647493
2014	10.428384040462769
2015	10.450820956396713
2016	10.395330369734728