Year	Percent
1990	63.747
1991	63.76
1992	63.957
1993	64.152
1994	64.349
1995	64.546
1996	64.727
1997	64.905
1998	65.079
1999	65.251
2000	65.422
2001	65.602
2002	65.781
2003	65.959
2004	66.134
2005	66.307
2006	66.492
2007	66.67
2008	66.847
2009	67.027
2010	67.213
2011	67.419
2012	67.628
2013	67.662
2014	67.705
2015	67.744
2016	67.781
2017	67.908
2018	68.036
2019	68.167
2020	68.304
2021	68.445
2022	68.59
2023	68.739
2024	68.894
2025	69.054
2026	69.22
2027	69.39
2028	69.562
2029	69.736
2030	69.909