Year	Percent
1950	21.2739
1955	21.58061
1960	21.30402
1965	21.21628
1970	20.90243
1975	20.96466
1980	21.6891
1985	22.6349
1990	25.1214
1995	26.72655
2000	28.35187
2005	29.7756
2010	29.73833
2015	29.05181
2020	27.41088
2025	25.51295
2030	24.22083
2035	23.9905
2040	24.44798
2045	24.92396
2050	24.6558
2055	24.04504
2060	23.69405
2065	23.32504
2070	23.32935
2075	23.46888
2080	23.3862
2085	23.09009
2090	22.7579
2095	22.54665
2100	22.48891