Year	Percent
1950	29.69226
1955	27.00425
1960	25.81709
1965	25.35586
1970	24.08528
1975	25.2707
1980	25.12514
1985	24.31708
1990	25.16932
1995	26.62755
2000	29.04971
2005	30.48291
2010	30.29046
2015	30.24772
2020	30.11947
2025	29.99999
2030	30.12011
2035	30.48557
2040	30.68121
2045	30.86977
2050	30.85142
2055	30.65976
2060	30.52952
2065	30.43178
2070	30.29598
2075	30.08302
2080	29.78414
2085	29.45465
2090	29.10543
2095	28.74344
2100	28.36049