Year	Percent
1950	13.21782
1955	13.04357
1960	12.92348
1965	12.76043
1970	12.44755
1975	12.09865
1980	11.80467
1985	11.63071
1990	11.67632
1995	12.13204
2000	12.32953
2005	12.60617
2010	13.28267
2015	13.58845
2020	13.87969
2025	14.25429
2030	14.70125
2035	15.69093
2040	17.00196
2045	18.37677
2050	19.61131
2055	20.42484
2060	20.96919
2065	21.41679
2070	21.9279
2075	22.52156
2080	23.10396
2085	23.59075
2090	23.95955
2095	24.26127
2100	24.55869