Year	Percent
1950	20.40283
1955	20.3131
1960	20.25617
1965	20.64608
1970	20.88674
1975	20.58628
1980	20.44668
1985	20.77451
1990	22.40673
1995	24.72469
2000	27.75069
2005	30.04906
2010	29.64141
2015	28.32619
2020	26.6381
2025	25.38396
2030	25.25534
2035	25.76481
2040	25.6039
2045	24.74254
2050	24.34785
2055	23.75352
2060	23.73216
2065	23.98408
2070	23.79601
2075	23.46974
2080	23.13563
2085	22.90996
2090	22.79919
2095	22.76392
2100	22.67917