Year % of population 2000 24.589433303062883 2001 24.812620104828884 2002 25.036668852859375 2003 25.265010146116623 2004 25.545653406818296 2005 25.841628110791234 2006 26.1263599745289 2007 26.469875866034965 2008 26.818206607217398 2009 27.103570039754423 2010 27.401348864644635 2011 27.732841801232475 2012 28.239570941876334 2013 28.63814212765055 2014 29.00172781843903 2015 29.364624705158047 2016 29.7206684914358 2017 30.080639379615075 2018 30.452712337589663 2019 30.821978189932953 2020 31.154710187644074 2021 31.219248328356112 2022 31.36289900019818