Year	Number
1996	1.32178819179535
1998	1.34391057491302
2000	1.28314232826233
2002	1.09719908237457
2003	1.27192747592926
2004	1.15839719772339
2005	1.13270270824432
2006	1.09850907325745
2007	1.00498068332672
2008	1.09782683849335
2009	0.957884192466736
2010	0.765691876411438
2011	0.988590955734253
2012	0.999240159988403
2013	0.989007890224457
2014	1.1219048500061
2015	1.16604828834534
2016	1.17588353157043
2017	1.16163265705109
2018	1.13318884372711
2019	1.16372573375702
2020	1.14607357978821
2021	1.10623216629028
2022	1.07860910892487