Year	Percent
1950	29.98424
1955	28.66526
1960	27.81629
1965	26.54079
1970	25.91074
1975	27.84269
1980	29.50626
1985	32.59843
1990	35.13501
1995	35.69581
2000	35.33062
2005	33.92046
2010	33.05636
2015	30.72352
2020	28.88879
2025	26.85039
2030	23.45225
2035	22.45428
2040	22.68285
2045	22.65458
2050	22.10842
2055	21.1914
2060	20.61133
2065	20.57454
2070	20.80781
2075	21.00469
2080	20.99168
2085	20.78586
2090	20.56017
2095	20.47477
2100	20.54729