Year	Number
1996	1.115647315979
1998	0.930101573467255
2000	1.14111149311066
2002	1.2535662651062
2003	0.876536011695862
2004	1.0929559469223
2005	1.1533499956131
2006	1.24849283695221
2007	1.17421102523804
2008	1.34467613697052
2009	1.17959117889404
2010	1.16941487789154
2011	1.19142174720764
2012	1.36817455291748
2013	1.378178358078
2014	1.18627142906189
2015	1.29889214038849
2016	1.47746896743774
2017	1.59912312030792
2018	1.46800899505615
2019	1.4803055524826
2020	1.43841421604156
2021	1.44232499599457
2022	1.45994246006012