Year	Percent
1990	39.523
1991	42.297
1992	44.251
1993	43.848
1994	42.899
1995	41.3
1996	36.7
1997	32.79
1998	33.72
1999	35.82
2000	34.37
2001	34
2002	24
2003	17.1
2004	13.93
2005	13.01
2006	12.56
2007	13.58
2008	13.39
2009	11.98
2010	10.98
2011	10.78
2012	10.56
2013	10.24
2014	9.71
2015	7.75
2016	7
2017	6.76
2018	6.52
2019	6.28
2020	6.04
2021	5.8
2022	5.56
2023	5.32
2024	5.079
2025	4.839
2026	4.599
2027	4.359
2028	4.119
2029	3.879
2030	3.639