| Year | Total Built | Identified(Seen) | Identified % | Seen % |
| 1948 | 4801 | 153(57) | 3.2% | 1.2% |
| 1947 | 5310 | 168(80) | 3.2% | 1.5% |
| 1946 | 4535 | 299(91) | 6.6% | 2% |
| 1945 | 3474 | 190(65) | 5.5% | 1.9% |
| 1944 | 3425 | 304(100) | 8.9% | 2.9% |
| 1943 | 3617 | 227(86) | 6.3% | 2.4% |
| 1942 | 3094 | 229(75) | 7.4% | 2.4% |
| 1941 | 3279 | 245(95) | 7.5% | 2.9% |
| 1940 | 2673 | 216(94) | 8.1% | 3.5% |
| 1939 | 2195 | 360(102) | 16.4% | 4.6% |
| 1938 | 3001 | 238(74) | 7.9% | 2.5% |
| 1937 | 3689 | 248(108) | 6.7% | 2.9% |
| 1936 | 3229 | 334(81) | 10.3% | 2.5% |
| 1935 | 3268 | 220(95) | 6.7% | 2.9% |
| 1934 | 3595 | 407(104) | 11.3% | 2.9% |
| 1933 | 2494 | 239(61) | 9.6% | 2.4% |
| 1932 | 3001 | 167(60) | 5.6% | 2% |
| 1931 | 4272 | 268(112) | 6.3% | 2.6% |
| 1930 | 4474 | 409(102) | 9.1% | 2.3% |
| 1929 | 3275 | 303(82) | 9.3% | 2.5% |
| 1928 | 3133 | 235(62) | 7.5% | 2% |
| 1927 | 5746 | 257(88) | 4.5% | 1.5% |
| 1926 | 4573 | 182(57) | 4% | 1.2% |
| 1925 | 2108 | 73(24) | 3.5% | 1.1% |
| 1924 | 2117 | 20(17) | 0.9% | 0.8% |
| 1923 | 2052 | 60(27) | 2.9% | 1.3% |
| 1922 | 1081 | 29(19) | 2.7% | 1.8% |
| 1921 | 910 | 95(23) | 10.4% | 2.5% |
| 1920 | 1336 | 19(17) | 1.4% | 1.3% |
| 1919 | 1062 | 40(20) | 3.8% | 1.9% |
| 1918 | 462 | 20(10) | 4.3% | 2.2% |
| 1917 | 598 | 15(9) | 2.5% | 1.5% |
| 1916 | 181 | 4(3) | 2.2% | 1.7% |
| 1915 | 162 | 4(4) | 2.5% | 2.5% |
| 1914 | 226 | 5(5) | 2.2% | 2.2% |
| 1913 | 256 | 8(8) | 3.1% | 3.1% |
| 1912 | 152 | 2(2) | 1.3% | 1.3% |
| 1911 | 210 | 4(4) | 1.9% | 1.9% |
| 1910 | 185 | 6(5) | 3.2% | 2.7% |
| 1909 | 135 | 2(1) | 1.5% | 0.7% |
| 1908 | 156 | 2(1) | 1.3% | 0.6% |
| 1907 | 398 | 7(6) | 1.8% | 1.5% |
| 1906 | 209 | 4(2) | 1.9% | 1% |
| 1905 | 132 | 5(5) | 3.8% | 3.8% |
| 1904 | 178 | 8(6) | 4.5% | 3.4% |
| 1903 | 282 | 3(3) | 1.1% | 1.1% |
| 1902 | 218 | 11(9) | 5% | 4.1% |
| 1901 | 182 | 3(3) | 1.6% | 1.6% |
| 1900 | 412 | 9(9) | 2.2% | 2.2% |
| 1899 | 368 | 6(6) | 1.6% | 1.6% |
| 1898 | 348 | 6(6) | 1.7% | 1.7% |