Year	Percent
1990	70.549
1991	70.293
1992	70.053
1993	69.615
1994	69.103
1995	68.77
1996	68.449
1997	68.99
1998	68.819
1999	69.224
2000	69.545
2001	69.981
2002	70.466
2003	70.893
2004	70.827
2005	70.683
2006	70.54
2007	70.354
2008	69.335
2009	68.334
2010	67.83
2011	68.228
2012	68.807
2013	69.605
2014	70.189
2015	70.635
2016	71.018
2017	71.054
2018	71.089
2019	71.113
2020	71.116
2021	71.116
2022	71.097
2023	71.032
2024	70.886
2025	70.635
2026	70.258
2027	69.777
2028	69.215
2029	68.614
2030	68