Year	Number
1996	1.41403770446777
1998	1.40335631370544
2000	1.38048672676086
2002	1.36772322654724
2003	1.34903717041016
2004	1.18535709381104
2005	1.29056811332703
2006	1.44416701793671
2007	1.32086098194122
2008	1.5633772611618
2009	1.48047006130219
2010	1.40638220310211
2011	1.46513664722443
2012	1.4543833732605
2013	1.35117244720459
2014	1.20008456707001
2015	0.989431440830231
2016	1.04431366920471
2017	0.799872100353241
2018	0.385415732860565
2019	0.592136740684509
2020	0.44402226805687
2021	0.498197883367538
2022	0.428703635931015