Year	Number
1982	1.7978799453195973
1983	2.0567532951350094
1984	4.4881242741754095
1985	1.5532960767767106
1986	1.4118766832502379
1987	1.1789339409993622
1988	1.789063703383094
1989	1.5076084801944614
1990	1.901894366026185
1991	1.924733495136631
1992	2.325012349099074
1993	1.5706864967211907
1994	1.0070759694600946
1995	1.0407192099653162
1996	0.9822104032659961
1997	1.032603340133515
1998	0.9068763720059125
1999	1.085114992410615
2000	0.926989148197968
2001	0.9503869574726753
2002	0.8704118440439005
2003	0.8643477247420167
2004	0.8391085770597532
2005	1.0852400149160402
2006	1.1299261064041621
2007	1.078380767910371
2008	1.3477867678044566
2009	1.0816479105244245
2010	1.2681985907602211
2011	1.3656355951189578
2012	1.1700172413144911
2013	1.3936398381576978
2014	1.5325536118402043
2015	1.2791834502800128
2016	1.7703327828290307
2017	1.4106831035544531
2018	1.6692323841814636
2019	1.6524176284207768
2020	1.306469211418547
2021	1.4318118390357215
2022	1.5904257030166278
2023	1.5612785729908463