Year	Number
1996	0.576565086841583
1998	0.701060175895691
2000	0.935157179832459
2002	0.908920228481293
2003	0.947880446910858
2004	1.14497804641724
2005	1.33629047870636
2006	1.1909122467041
2007	1.10401487350464
2008	1.13101947307587
2009	0.965701699256897
2010	0.935810565948486
2011	0.948596119880676
2012	1.0062894821167
2013	0.922868311405182
2014	1.15322852134705
2015	1.03520536422729
2016	0.73615837097168
2017	0.818202197551727
2018	0.776450574398041
2019	-0.228379547595978
2020	0.0566768497228622
2021	0.263209611177444
2022	0.61155503988266