Year	Percent
1950	17.75193
1955	17.43686
1960	18.26513
1965	18.2559
1970	17.99538
1975	17.76006
1980	17.43444
1985	17.20797
1990	17.03546
1995	16.65443
2000	16.22293
2005	15.80436
2010	15.46779
2015	15.13709
2020	14.43682
2025	13.7356
2030	13.09471
2035	12.53878
2040	12.04704
2045	11.56918
2050	11.08871
2055	10.61817
2060	10.17699
2065	9.77244
2070	9.39325
2075	9.03577
2080	8.70595
2085	8.39192
2090	8.06431
2095	7.77425
2100	7.49067