Year	Percent
1950	20.10817
1955	21.18897
1960	21.32479
1965	21.92301
1970	22.49773
1975	22.62595
1980	22.99714
1985	22.70771
1990	23.31019
1995	23.96672
2000	25.12806
2005	26.72889
2010	27.6382
2015	29.15529
2020	30.04645
2025	29.43147
2030	28.01992
2035	25.82079
2040	24.25334
2045	23.8024
2050	24.07874
2055	24.14857
2060	23.47316
2065	22.47444
2070	21.70093
2075	21.44631
2080	21.72328
2085	22.09811
2090	22.16213
2095	21.90367
2100	21.54159