the compulsory licensing of professional services means aerial mapping,

10.002885 3.9669% 1936 1.702729 0.587292 0.0000% 1935 1.032811 0.968231 3.2811% 1934 0.960642 1.040970 8.9328% 1933 1.513443 0.660745 -2.6088% 1932 0.877821 1.139185 -11.5407% 1931 0.047087 21.237162 -8.4517% 1930 1.945266 0.514068 -2.7367% 1929 0.099046 10.096306 0.0000% 1922 1.972893 0.506870 0.0000% 1928 0.660616 1.513740 2.8137% 1921 1.868476 0.535196 -7.1894% 1920 2.067545 0.483665 -13.0688% 1919 1.353868 0.738624 15.7925% 1918 2.268732 0.440775 14.2845% 1917 0.685547 1.458690 16.6637% 1916 1.628650 0.614006 20.0069% 1915 0.646238 1.547418 9.1939% 1914 1.023510 0.977030 2.3510%

Dirac