Year	Percent
1950	25.76752
1955	25.59704
1960	29.2533
1965	33.20549
1970	33.30593
1975	29.72349
1980	31.12982
1985	30.64235
1990	33.9454
1995	38.10478
2000	35.37731
2005	34.60733
2010	31.82352
2015	29.88642
2020	30.49587
2025	30.03519
2030	28.96888
2035	27.58744
2040	26.71907
2045	26.29124
2050	26.31111
2055	26.11633
2060	25.49154
2065	24.69081
2070	24.06425
2075	23.76382
2080	23.66292
2085	23.51005
2090	23.16484
2095	22.71216
2100	22.33993