Year	Number
1985	1.6271086779910486
1986	3.1272710076706733
1987	2.569638575794363
1988	2.9906337252979824
1989	4.725594227704728
1990	3.926547650239015
1991	4.9441371052416905
1992	6.227697006319083
1993	6.5724423190422545
1994	8.866430338265992
1995	9.2023261961177
1996	11.034162653407982
1997	9.594116010266296
1998	4.786449289595934
1999	4.7625122146139045
2000	2.738971923194396
2001	1.3302515753756414
2002	4.4337848919473055
2003	4.170610663121306
2004	3.1444226932608212
2005	3.5091522652556524
2006	3.418265191924167
2007	4.715016660423902
2008	5.248281257407499
2009	7.206232212527741
2010	6.440553776373188
2011	4.486259997182911
2012	3.927975913397331
2013	4.26781634100802
2014	4.026358341569951
2015	1.9227500828987552
2016	1.515020736227483
2017	1.3005431836877672
2018	0.8925412488607843