Year	Percent
1990	41.214
1991	41.539
1992	41.78
1993	41.94
1994	42.098
1995	42.325
1996	42.705
1997	43.101
1998	43.53
1999	43.984
2000	44.441
2001	44.859
2002	44.546
2003	44.157
2004	43.675
2005	45.271
2006	45.621
2007	44.776
2008	45.704
2009	46.159
2010	47.848
2011	47.668
2012	48.279
2013	49.777
2014	51.315
2015	52.853
2016	51.855
2017	52.094
2018	52.332
2019	52.591
2020	52.883
2021	53.212
2022	53.562
2023	53.933
2024	54.327
2025	54.741
2026	55.185
2027	55.647
2028	56.109
2029	56.542
2030	56.928