Year	Percent
1990	69.978
1991	69.999
1992	70.12
1993	69.955
1994	70.217
1995	70.322
1996	69.704
1997	69.01
1998	69.017
1999	69.11
2000	68.894
2001	67.886
2002	68.226
2003	68.012
2004	64.858
2005	66.129
2006	66.312
2007	67.199
2008	67.15
2009	67.058
2010	66.864
2011	66.625
2012	66.648
2013	66.642
2014	66.102
2015	65.994
2016	66.222
2017	66.013
2018	65.774
2019	65.499
2020	65.185
2021	64.813
2022	64.41
2023	63.983
2024	63.538
2025	63.081
2026	62.61
2027	62.137
2028	61.673
2029	61.234
2030	60.829