Year	% gross
1975	8.67216014862061
1998	21.1123294830322
1999	31.0614490509033
2004	25.1977806091309
2012	36.9199981689453
2014	41.9436302185059
2015	47.3548393249512
2018	45.4958686828613
2019	49.8568496704102
2020	50.5761299133301