Year	Percent
1990	0.295
1991	0.298
1992	0.299
1993	0.301
1994	0.285
1995	0.269
1996	0.269
1997	0.262
1998	0.259
1999	0.263
2000	0.26
2001	0.89
2002	0.44
2003	0.98
2004	0.47
2005	0.62
2006	0.33
2007	0.36
2008	0.57
2009	1.12
2010	1.11
2011	0.53
2012	0.91
2013	1.16
2014	1.83
2015	1.84
2016	1.22
2017	1.372
2018	1.524
2019	1.676
2020	1.828
2021	1.98
2022	2.132
2023	2.284
2024	2.436
2025	2.588
2026	2.74
2027	2.892
2028	3.044
2029	3.195
2030	3.347