Year Number 1996 43.6170196533203 1998 46.8085098266602 2000 61.375659942627 2002 60.8465614318848 2003 59.7989959716797 2004 67.9611663818359 2005 74.271842956543 2006 69.5652160644531 2007 70.0483093261719 2008 69.711540222168 2009 63.9810409545898 2010 62.5592422485352 2011 62.0853080749512 2012 64.9289093017578 2013 63.9810409545898 2014 73.3333358764648 2015 67.1428604125977 2016 58.0952377319336 2017 61.9047622680664 2018 58.9622650146484 2019 23.5849056243896 2020 34.4339637756348 2021 41.5094337463379 2022 51.886791229248