Year	% of total
1990	9.569615391033413
1991	9.37472097104806
1992	8.899988983339236
1993	9.209586791497467
1994	9.378708725894274
1995	9.710163782108854
1996	9.76628473312085
1997	9.61151923193191
1998	9.393045059902922
1999	9.137535901843966
2000	8.913309656821527
2001	8.707537541992437
2002	8.885016208639906
2003	9.983901476861883
2004	9.200401843309269
2005	9.76925643178555
2006	9.80651390693687
2007	9.338412194041018
2008	9.124498077676728
2009	8.31860114890659
2010	9.797276293262934
2011	10.531369080847435
2012	9.6874690951637
2013	10.105646321592648
2014	10.312622384210089
2015	10.565554321967015
2016	10.559220698929199