Year	Percent
1950	15.26742
1955	16.22049
1960	16.25644
1965	14.28095
1970	13.41895
1975	11.20913
1980	9.89693
1985	9.61066
1990	10.25958
1995	9.44687
2000	7.63724
2005	6.68668
2010	6.71824
2015	7.05907
2020	6.96325
2025	6.70038
2030	6.45403
2035	6.20603
2040	6.01462
2045	5.90708
2050	5.83663
2055	5.73155
2060	5.58222
2065	5.42761
2070	5.30262
2075	5.20794
2080	5.14064
2085	5.08476
2090	5.02237
2095	4.96532
2100	4.9118