Year	Percent change
1980	17.984
1981	9.172
1982	6.83
1983	16.657
1984	31.255
1985	29.7
1986	24.4
1987	11.2
1988	8.2
1989	16.12
1990	24.779
1991	51.071
1992	77.297
1993	22.07
1994	35.063
1995	19.909
1996	26.407
1997	9.658
1998	8.632
1999	5.982
2000	4.593
2001	9.509
2002	8.224
2003	9.942
2004	14.842
2005	13.419
2006	8.924
2007	9.17
2008	22.007
2009	9.578
2010	12.613
2011	7.526
2012	6.895
2013	9.356
2014	8.275
2015	3.683
2016	2.349
2017	4.383
2018	3.733
2019	3.636
2020	4.93
2021	5
2022	5
2023	5
2024	5