Year	Percent
1950	27.26913
1955	22.81683
1960	24.2251
1965	23.6129
1970	27.75431
1975	29.44552
1980	30.0598
1985	33.83773
1990	30.78371
1995	29.07343
2000	29.02393
2005	28.18427
2010	29.31383
2015	29.73879
2020	28.21494
2025	25.62793
2030	23.21483
2035	21.51193
2040	20.9658
2045	21.46255
2050	21.66945
2055	21.30139
2060	20.69238
2065	20.11893
2070	19.9475
2075	20.25349
2080	20.74541
2085	21.04636
2090	20.97943
2095	20.67251
2100	20.38249