Year	Percent
1950	17.62793
1955	16.85468
1960	15.15082
1965	14.55164
1970	14.7601
1975	14.91907
1980	15.38188
1985	16.27519
1990	16.85158
1995	16.61492
2000	17.90669
2005	20.05256
2010	21.86599
2015	20.85992
2020	22.15195
2025	24.5325
2030	27.32326
2035	30.20647
2040	31.38712
2045	30.24389
2050	27.02733
2055	23.87184
2060	21.70211
2065	21.4249
2070	22.75663
2075	23.43357
2080	23.43135
2085	22.38824
2090	21.30594
2095	21.02826
2100	21.50815