Year	Percent
1990	66.959
1991	66.652
1992	66.335
1993	66.203
1994	66.043
1995	65.191
1996	64.39
1997	63.732
1998	64.438
1999	65.124
2000	65.771
2001	65.891
2002	65.931
2003	65.895
2004	65.798
2005	65.657
2006	65.58
2007	65.459
2008	65.318
2009	65.195
2010	65.112
2011	65.259
2012	65.47
2013	65.734
2014	66.036
2015	65.961
2016	66.199
2017	66.608
2018	67.018
2019	67.411
2020	67.776
2021	68.111
2022	68.418
2023	68.685
2024	68.894
2025	69.035
2026	69.117
2027	69.139
2028	69.131
2029	69.136
2030	69.181