Year	Percent
1950	21.05574
1955	21.84357
1960	21.73676
1965	22.13758
1970	22.63076
1975	22.89439
1980	23.40349
1985	23.11604
1990	23.57272
1995	24.10397
2000	25.13851
2005	26.61954
2010	27.55787
2015	28.92347
2020	29.79862
2025	29.18161
2030	27.77748
2035	25.53137
2040	23.79144
2045	23.05353
2050	23.07672
2055	22.92681
2060	22.15571
2065	21.23157
2070	20.53408
2075	20.39357
2080	20.76564
2085	21.20815
2090	21.32683
2095	21.11402
2100	20.79329