Year	Percent (Units)
1980	0.217
1981	0.225
1982	0.243
1983	0.254
1984	0.263
1985	0.269
1986	0.268
1987	0.265
1988	0.267
1989	0.277
1990	0.280
1991	0.289
1992	0.283
1993	0.300
1994	0.317
1995	0.335
1996	0.353
1997	0.366
1998	0.377
1999	0.382
2000	0.389
2001	0.406
2002	0.423
2003	0.436
2004	0.447
2005	0.459
2006	0.466
2007	0.475
2008	0.487
2009	0.516
2010	0.521
2011	0.534
2012	0.563
2013	0.573
2014	0.601
2015	0.624
2016	0.662
2017	0.694
2018	0.720
2019	0.752
2020	0.797
2021	0.768
2022	0.803
2023	0.818
2024	0.840
2025	0.866
2026	0.895
2027	0.924
2028	0.955
2029	0.987