Year	Percent
1991	65.828
1992	66.432
1993	44.163
1994	45.523
1995	41.408
1996	39.851
1997	39.416
1998	39.952
1999	38.839
2000	38.953
2001	38.167
2002	37.751
2003	48.747
2004	49.036
2005	72.677
2006	59.78
2007	59.597
2008	59.398
2009	59.204
2010	58.622
2011	69.264
2012	67.175
2013	66.64
2014	67.19
2015	73.787
2016	73.661
2017	71.958
2018	71.866
2019	71.723
2020	71.618
2021	71.523
2022	71.427