Year	Percent
1990	13.76
1991	14.75
1992	12.93
1993	10.821
1994	9.02
1995	9.7
1996	5.74
1997	6.77
1998	7.486
1999	8.272
2000	9.132
2001	10.071
2002	11.096
2003	12.21
2004	10.95
2005	11.786
2006	12.677
2007	13.625
2008	14.632
2009	15.7
2010	14.8
2011	16.15
2012	13.82
2013	18.1
2014	14
2015	15.217
2016	18
2017	18.151
2018	18.302
2019	18.453
2020	18.604
2021	18.755
2022	18.906
2023	19.057
2024	19.208
2025	19.359
2026	19.51
2027	19.661
2028	19.812
2029	19.963
2030	20.114