Year	Percent
1950	18.11131
1955	18.41777
1960	18.62373
1965	18.96333
1970	19.28481
1975	19.39722
1980	19.17388
1985	18.46489
1990	17.72016
1995	17.51997
2000	17.3186
2005	16.87242
2010	16.37549
2015	15.43073
2020	14.67576
2025	14.05203
2030	13.51962
2035	12.94995
2040	12.31765
2045	11.68586
2050	11.12329
2055	10.64461
2060	10.23067
2065	9.85318
2070	9.46356
2075	9.07253
2080	8.706
2085	8.38414
2090	8.09929
2095	7.80629
2100	7.53502