Year	Percent
1950	16.70522
1955	16.91908
1960	17.13119
1965	17.55087
1970	17.86432
1975	17.79649
1980	15.8801
1985	16.63394
1990	21.84355
1995	22.7607
2000	23.07105
2005	23.11502
2010	25.25875
2015	27.20267
2020	28.90508
2025	30.63057
2030	32.17994
2035	33.47421
2040	33.90473
2045	34.27586
2050	34.38479
2055	34.30964
2060	34.42111
2065	34.74874
2070	35.22716
2075	35.67628
2080	36.10461
2085	36.52826
2090	37.0009
2095	37.5342
2100	38.04712