Year	Percent
1990	4.3
1991	8.89
1992	7.893
1993	7
1994	6.899
1995	6.8
1996	7.39
1997	5.915
1998	4.72
1999	5.42
2000	6.06
2001	5.501
2002	4.99
2003	4.94
2004	4.89
2005	4.84
2006	5.51
2007	5.27
2008	5.61
2009	6.036
2010	7.265
2011	6.203
2012	5.287
2013	4.5
2014	5.19
2015	4.6
2016	4.618
2017	4.655
2018	4.693
2019	4.731
2020	4.768
2021	4.806
2022	4.844
2023	4.881
2024	4.919
2025	4.957
2026	4.994
2027	5.032
2028	5.07
2029	5.108
2030	5.145