Year	Percent
1950	30.08379
1955	29.31726
1960	30.30405
1965	28.58439
1970	27.95331
1975	27.37625
1980	27.38387
1985	29.16992
1990	30.00648
1995	30.63702
2000	29.76091
2005	27.72665
2010	24.95167
2015	22.27212
2020	20.77939
2025	20.4046
2030	20.56776
2035	20.46141
2040	20.2476
2045	19.85478
2050	19.46268
2055	19.58647
2060	19.99371
2065	20.45258
2070	20.71779
2075	20.71031
2080	20.52763
2085	20.34784
2090	20.27829
2095	20.2979
2100	20.31256