Year	Percent
1950	29.30341
1955	30.44207
1960	33.07117
1965	30.80274
1970	28.21856
1975	27.68131
1980	28.24285
1985	30.70529
1990	30.43436
1995	29.91817
2000	29.06006
2005	29.10363
2010	30.32468
2015	29.62944
2020	27.40347
2025	24.38757
2030	22.05364
2035	22.1187
2040	23.57624
2045	24.73325
2050	24.51953
2055	23.29971
2060	22.51411
2065	22.53993
2070	23.23355
2075	23.92257
2080	23.99657
2085	23.44504
2090	22.75978
2095	22.4276
2100	22.5181