Year	Percent
1950	29.76668
1955	29.35554
1960	28.74126
1965	27.9362
1970	27.39341
1975	27.67411
1980	27.95934
1985	28.4617
1990	29.21801
1995	29.76295
2000	30.25488
2005	30.63717
2010	30.61654
2015	30.62857
2020	30.99342
2025	31.3626
2030	31.79629
2035	31.88433
2040	31.54026
2045	31.13539
2050	30.76734
2055	30.52029
2060	30.26446
2065	29.95592
2070	29.58986
2075	29.21335
2080	28.85373
2085	28.5024
2090	28.16004
2095	27.78162
2100	27.37057