Year	% gross
2001	33.6422691345215
2002	31.3616905212402
2003	33.8471984863281
2004	37.4683303833008
2005	37.8230514526367
2006	36.1485214233398
2007	36.8360214233398
2008	39.8071784973145
2009	45.3185005187988
2010	46.1282691955566
2011	40.2991905212402
2012	44.671558380127
2013	46.7160186767578
2014	49.0527305603027
2015	48.0236015319824
2016	46.7017211914062
2017	48.7315788269043
2018	47.9830513000488