Year	Percent
1990	36.809
1991	37.438
1992	37.935
1993	38.284
1994	38.462
1995	38.469
1996	38.918
1997	39.223
1998	39.444
1999	39.65
2000	40.173
2001	40.699
2002	41.226
2003	41.756
2004	42.287
2005	42.821
2006	43.356
2007	43.892
2008	44.43
2009	45.792
2010	47.165
2011	47.956
2012	48.736
2013	49.665
2014	50.912
2015	52.567
2016	54.321
2017	54.516
2018	54.711
2019	54.905
2020	55.1
2021	55.295
2022	55.49
2023	55.684
2024	55.879
2025	56.074
2026	56.269
2027	56.463
2028	56.658
2029	56.853
2030	57.048