Year	Number
1996	1.73164963722229
1998	1.80350625514984
2000	1.84726524353027
2002	1.88022816181183
2003	1.93046128749847
2004	1.84377062320709
2005	1.67952907085419
2006	1.82738518714905
2007	1.86356592178345
2008	1.77165818214417
2009	1.66273927688599
2010	1.81252110004425
2011	1.60288524627686
2012	1.56018972396851
2013	1.57191109657288
2014	1.55362224578857
2015	1.45145058631897
2016	1.47535490989685
2017	1.46740829944611
2018	1.45610499382019
2019	1.49224412441254
2020	1.60626363754272
2021	1.53002023696899
2022	1.46545016765594