Year	Percent
1950	12.45877
1955	12.71397
1960	12.91862
1965	12.88962
1970	12.956
1975	13.1857
1980	13.4106
1985	13.77771
1990	14.40687
1995	15.42108
2000	17.01233
2005	19.17847
2010	20.8754
2015	21.86121
2020	22.64585
2025	23.07187
2030	23.87212
2035	24.71897
2040	25.12194
2045	25.2968
2050	25.21417
2055	25.24776
2060	25.30854
2065	25.21898
2070	24.95847
2075	24.58355
2080	24.19607
2085	23.84559
2090	23.51095
2095	23.19873
2100	22.90304