Year	Percent
1990	43.433
1991	43.787
1992	44.99
1993	45.569
1994	47.956
1995	48.808
1996	48.341
1997	48.298
1998	48.813
1999	48.98
2000	48.944
2001	48.779
2002	50.154
2003	50.185
2004	49.359
2005	50.667
2006	51.242
2007	52.116
2008	52.676
2009	53.373
2010	53.507
2011	53.84
2012	54.336
2013	54.597
2014	54.561
2015	54.536
2016	54.947
2017	54.951
2018	54.915
2019	54.844
2020	54.735
2021	54.586
2022	54.411
2023	54.209
2024	53.986
2025	53.749
2026	53.529
2027	53.305
2028	53.084
2029	52.879
2030	52.698