Year	Percent
1950	27.72155
1955	28.26878
1960	25.19901
1965	25.4196
1970	24.32058
1975	22.63622
1980	23.17919
1985	22.67857
1990	24.39587
1995	26.39776
2000	28.07893
2005	28.00046
2010	26.3687
2015	26.65868
2020	28.52095
2025	29.16334
2030	29.49915
2035	27.8669
2040	24.30808
2045	22.49203
2050	21.84357
2055	21.71876
2060	22.95222
2065	23.6976
2070	23.17695
2075	22.54641
2080	22.13444
2085	22.16575
2090	22.53467
2095	22.88626
2100	22.80507