Year	Percent
1990	70.264
1991	68.958
1992	68.982
1993	68.452
1994	68.89
1995	69.338
1996	70.639
1997	72.228
1998	72.874
1999	72.406
2000	72.853
2001	72.489
2002	72.012
2003	70.83
2004	70.44
2005	70.298
2006	70.466
2007	70.813
2008	71.676
2009	70.335
2010	69.655
2011	68.797
2012	69.007
2013	68.434
2014	68.077
2015	68.427
2016	67.828
2017	67.597
2018	67.4
2019	67.207
2020	66.999
2021	66.739
2022	66.467
2023	66.192
2024	65.93
2025	65.689
2026	65.446
2027	65.226
2028	65.018
2029	64.8
2030	64.559