Year	Number
1996	1.31814324855804
1998	1.33475875854492
2000	1.31340384483337
2002	1.31074380874634
2003	1.33278954029083
2004	1.35322546958923
2005	1.26966309547424
2006	1.25131320953369
2007	1.0855348110199
2008	1.17518770694733
2009	1.67873132228851
2010	1.83911716938019
2011	1.80468726158142
2012	1.79332208633423
2013	1.83372759819031
2014	2.07766795158386
2015	2.01081037521362
2016	1.98304605484009
2017	1.99748241901398
2018	1.95854675769806
2019	1.92107594013214
2020	1.9594247341156
2021	1.66537773609161
2022	1.71432709693909