Year	Percent
1950	20.58647
1955	21.13798
1960	21.43739
1965	21.78504
1970	22.00553
1975	21.56954
1980	20.89025
1985	20.14148
1990	19.74934
1995	19.9628
2000	20.47983
2005	20.82644
2010	20.97448
2015	21.36572
2020	22.60298
2025	23.47675
2030	24.35648
2035	24.88503
2040	24.51531
2045	24.58854
2050	24.60975
2055	24.65604
2060	24.79793
2065	24.72802
2070	24.59013
2075	24.3417
2080	24.10533
2085	23.89361
2090	23.69111
2095	23.47806
2100	23.25037