Year % 2000 8.211983767008833 2001 8.377183750789307 2002 9.730647900994905 2003 9.291061206516952 2004 9.988562714449106 2005 12.018004501125283 2006 13.253012048192778 2007 13.407059536433875 2008 13.406395436120702 2009 13.172274949669257 2010 13.970074115508323 2011 15.205724508050091 2012 15.768963117606123 2013 17.010014306151646 2014 16.280451574569224 2015 18.825853796217892 2016 18.649292419784228 2017 19.04697986577182 2018 18.802112284602565 2019 19.031387586990494 2020 20.655935008274422 2021 21.565975353171037 2022 21.934720108236103 2023 21.87500000000001