Year	Number
1996	1.28616893291473
1998	1.30419409275055
2000	1.32083249092102
2002	1.17653274536133
2003	1.03586626052856
2004	0.46060311794281
2005	0.587014853954315
2006	0.783710896968842
2007	0.746574640274048
2008	0.801951885223389
2009	0.741995573043823
2010	0.721381723880768
2011	0.715651512145996
2012	0.661697506904602
2013	0.712042570114136
2014	1.04513800144196
2015	1.06861555576324
2016	1.08180165290833
2017	1.08055830001831
2018	1.12343680858612
2019	1.18631422519684
2020	1.17342627048492
2021	1.19062948226929
2022	1.21925568580627