Year	%
1981	2.98431815932558
1982	3.64747477698977
1983	19.7679566445309
1984	3.7907915870825897
1985	21.1437555154512
1986	16.821028263901898
1987	81.14210776899769
1988	30.5602963231883
1989	51.5341349070565
1990	56.754904260762494
1991	57.324886803775
1992	51.120378466850504
1993	60.754868083682304
1994	49.8629706407192
1995	54.9183192043955
1996	62.232836811762205
1997	68.8508287774617
1998	85.780419690088
1999	78.3213385511316
2000	91.76178894704921
2001	76.07084966040651
2002	56.8659287489933
2003	50.9697621692931
2004	64.7141346247532
2005	74.1733818802068
2006	100.707064456235
2007	114.90948419641501
2008	186.229124793343
2009	91.4003950918622
2010	71.80145979369989
2011	83.6397254431468
2012	49.2687121794553
2013	36.3752674967056
2014	46.647428516439795
2015	49.5106004128507
2016	45.1795390448426
2017	35.0492542036087
2018	44.5685
2019	34.4117