Year	Percent
1950	21.06788
1955	20.00822
1960	19.15432
1965	17.48209
1970	15.96087
1975	14.89923
1980	13.98133
1985	13.13848
1990	12.36761
1995	12.21814
2000	13.60223
2005	16.62683
2010	19.22052
2015	20.97322
2020	22.24294
2025	23.42602
2030	25.60024
2035	26.07554
2040	25.02576
2045	23.15606
2050	22.02187
2055	23.7611
2060	25.93878
2065	27.63969
2070	27.63326
2075	25.91762
2080	24.85803
2085	24.74598
2090	25.30661
2095	25.87107
2100	25.90796