Year	%
1975	15.9914957386625
1976	14.6496485189474
1977	12.488998724604
1978	20.975110152931702
1979	17.0701240523777
1980	17.2448417224957
1981	20.8387701367176
1982	24.156216953749198
1983	19.9771733795354
1984	17.0654297885855
1985	22.0437359498321
1986	36.0506740564704
1987	57.4680362222403
1988	28.882879715680097
1989	32.7713035557564
1990	39.1789533143269
1991	34.4684925885031
1992	35.6621242668622
1993	35.2165063214633
1994	45.4186612159557
1995	42.2562378841324
1996	46.069416399577904
1997	58.339863412883695
1998	399.58537403964203
1999	48.1456753845711
2000	74.6768906570515
2001	83.50381173153491
2002	106.776523211541
2003	81.3482805771592
2004	84.90327826070579
2005	72.3028472444628
2006	83.005284497332
2007	105.67159664033201
2008	163.404318400117
2009	65.98085370233589
2010	70.6337389206163
2011	85.5851643766579
2012	59.4228436477739
2013	48.043286497852
2014	56.024756366065795
2015	63.609300000000005