Year	Percent
1950	28.45498
1955	27.93369
1960	29.43187
1965	27.03687
1970	28.09614
1975	29.25629
1980	30.70234
1985	32.06998
1990	31.17252
1995	30.23826
2000	28.97082
2005	27.78412
2010	26.57097
2015	25.12948
2020	24.7015
2025	24.38588
2030	24.35648
2035	24.4321
2040	24.25392
2045	23.89466
2050	23.53173
2055	23.4034
2060	23.42567
2065	23.43353
2070	23.31152
2075	23.04626
2080	22.74063
2085	22.5086
2090	22.36888
2095	22.27179
2100	22.14976