Year	Percent
1990	34.85
1991	35.646
1992	36.345
1993	38.756
1994	38.5
1995	38.277
1996	39.165
1997	40.231
1998	40.313
1999	42.211
2000	40.353
2001	41.361
2002	42.376
2003	42.671
2004	42.46
2005	43.519
2006	44.687
2007	44.26
2008	43.355
2009	42.861
2010	42.388
2011	42.006
2012	41.65
2013	41.302
2014	40.947
2015	40.585
2016	40.774
2017	40.919
2018	41.055
2019	41.177
2020	41.29
2021	41.427
2022	41.553
2023	41.667
2024	41.778
2025	41.894
2026	42.045
2027	42.203
2028	42.357
2029	42.494
2030	42.612