| Year | Pop. | ±% p.a. |
|---|
| 1793 | 3,030 | — |
|---|
| 1800 | 2,459 | −2.94% |
|---|
| 1806 | 2,831 | +2.38% |
|---|
| 1821 | 3,242 | +0.91% |
|---|
| 1831 | 3,750 | +1.47% |
|---|
| 1836 | 4,240 | +2.49% |
|---|
| 1841 | 4,264 | +0.11% |
|---|
| 1846 | 4,851 | +2.61% |
|---|
| 1851 | 5,408 | +2.20% |
|---|
| 1856 | 8,410 | +9.23% |
|---|
| 1861 | 10,803 | +5.14% |
|---|
| 1866 | 13,673 | +4.82% |
|---|
| 1872 | 12,946 | −0.91% |
|---|
| 1876 | 13,771 | +1.56% |
|---|
| 1881 | 14,020 | +0.36% |
|---|
| 1886 | 14,678 | +0.92% |
|---|
| 1891 | 14,841 | +0.22% |
|---|
| 1896 | 15,781 | +1.24% |
|---|
| | Year | Pop. | ±% p.a. |
|---|
| 1901 | 16,599 | +1.02% |
|---|
| 1906 | 16,158 | −0.54% |
|---|
| 1911 | 15,480 | −0.85% |
|---|
| 1921 | 13,760 | −1.17% |
|---|
| 1926 | 13,932 | +0.25% |
|---|
| 1931 | 13,588 | −0.50% |
|---|
| 1936 | 13,278 | −0.46% |
|---|
| 1946 | 12,935 | −0.26% |
|---|
| 1954 | 13,345 | +0.39% |
|---|
| 1962 | 14,138 | +0.72% |
|---|
| 1968 | 14,829 | +0.80% |
|---|
| 1975 | 15,491 | +0.63% |
|---|
| 1982 | 16,444 | +0.86% |
|---|
| 1990 | 17,629 | +0.87% |
|---|
| 1999 | 18,997 | +0.83% |
|---|
| 2007 | 19,757 | +0.49% |
|---|
| 2012 | 20,770 | +1.01% |
|---|
| 2017 | 20,800 | +0.03% |
|---|
|