Year Number 1996 85.638298034668 1998 90.9574432373047 2000 79.8941802978516 2002 82.539680480957 2003 57.2864303588867 2004 36.4077682495117 2005 33.980583190918 2006 25.1207733154297 2007 23.6714973449707 2008 17.3076915740967 2009 15.6398105621338 2010 14.2180099487305 2011 23.222749710083 2012 20.3791465759277 2013 18.0094795227051 2014 25.238094329834 2015 21.9047622680664 2016 22.8571434020996 2017 30 2018 29.2452831268311 2019 42.4528312683105 2020 40.5660362243652 2021 39.1509437561035 2022 45.7547187805176