Year	Percent (Units)
1992	0.360
1993	0.320
1994	0.272
1995	0.241
1996	0.233
1997	0.228
1998	0.217
1999	0.216
2000	0.226
2001	0.251
2002	0.268
2003	0.281
2004	0.293
2005	0.307
2006	0.323
2007	0.334
2008	0.335
2009	0.340
2010	0.347
2011	0.359
2012	0.367
2013	0.394
2014	0.389
2015	0.363
2016	0.364
2017	0.366
2018	0.367
2019	0.374
2020	0.375
2021	0.367
2022	0.366
2023	0.374
2024	0.373
2025	0.382
2026	0.379
2027	0.381
2028	0.378
2029	0.376