Year % (cumulative) 2004 21.0269203186035 2005 22.1900291442871 2006 23.2007503509521 2007 23.6869201660156 2008 26.4928703308105 2009 27.7024993896484 2010 29.9863891601562 2011 31.7986698150635 2012 32.7662582397461 2013 33.7585105895996 2014 35.237419128418 2015 37.073558807373 2016 37.6567001342773 2017 39.0266990661621 2018 33.6019554138184 2019 42.1706085205078 2020 36.4532737731934 2021 37.7613334655762 2022 39.2632904052734