Year	Percent
1950	25.14066
1955	28.69636
1960	31.62944
1965	32.09489
1970	29.39642
1975	30.4928
1980	31.18653
1985	33.12243
1990	31.90721
1995	30.86084
2000	28.74666
2005	28.57356
2010	28.38287
2015	28.03489
2020	27.40353
2025	26.09595
2030	25.46478
2035	24.56604
2040	23.74338
2045	23.11414
2050	22.28036
2055	21.65636
2060	21.25999
2065	21.00645
2070	20.81982
2075	20.66336
2080	20.50596
2085	20.38061
2090	20.31271
2095	20.29491
2100	20.28596