Year	Percent
1950	19.82655
1955	22.40429
1960	22.38666
1965	22.19092
1970	21.69937
1975	21.13941
1980	21.08012
1985	21.53534
1990	21.05475
1995	20.93585
2000	21.2077
2005	21.30495
2010	21.15883
2015	20.8278
2020	20.3953
2025	19.97113
2030	19.42757
2035	18.75904
2040	18.01129
2045	17.18374
2050	16.30588
2055	15.41834
2060	14.5428
2065	13.69302
2070	12.86463
2075	12.12611
2080	11.40277
2085	10.76082
2090	10.17099
2095	9.62363
2100	9.11883