Year	Percent
1950	17.86304
1955	18.45903
1960	16.85779
1965	14.19837
1970	12.50527
1975	12.63476
1980	12.30948
1985	11.16168
1990	9.868
1995	9.82867
2000	10.15976
2005	12.78724
2010	15.88267
2015	16.92434
2020	18.08802
2025	19.72405
2030	22.40061
2035	25.30944
2040	27.41126
2045	28.06405
2050	27.75705
2055	27.09262
2060	26.69802
2065	26.55651
2070	26.3666
2075	26.08709
2080	25.54399
2085	24.94805
2090	24.4587
2095	24.09998
2100	23.81996