Year	Number
2009	1.02569842338562
2010	1.01214551925659
2011	1.0010347366333
2012	0.996137678623199
2013	0.938787341117859
2014	0.916511118412018
2015	0.843033373355865
2016	0.815052211284637
2017	0.810150265693665
2018	0.808106005191803
2019	0.786948084831238
2020	0.766806840896606
2021	0.748871743679047
2022	0.756873250007629