Year	Number
2004	0.353214949369431
2005	1.19235050678253
2006	1.07728564739227
2007	1.07542657852173
2008	1.27092468738556
2009	1.2766444683075
2010	1.25646901130676
2011	1.24453473091125
2012	1.26281690597534
2013	1.27128553390503
2014	-0.0703446120023727
2015	0.183694764971733
2016	0.218476206064224
2017	0.510402023792267
2018	0.498739510774612
2019	0.490093946456909
2020	0.632899343967438
2021	0.361725926399231
2022	0.392122596502304