Year	Percent
1990	53.433
1991	53.167
1992	52.907
1993	52.723
1994	52.434
1995	52.173
1996	51.956
1997	52.922
1998	51.468
1999	49.716
2000	48.869
2001	49.821
2002	51.052
2003	50.553
2004	50.432
2005	50.435
2006	52.015
2007	52.915
2008	54.83
2009	54.365
2010	53.85
2011	53.017
2012	54.222
2013	53.924
2014	53.448
2015	54.26
2016	55.28
2017	55.209
2018	55.038
2019	54.793
2020	54.489
2021	54.147
2022	53.756
2023	53.342
2024	52.95
2025	52.611
2026	52.338
2027	52.155
2028	52.045
2029	51.975
2030	51.922