Numbers of live births to mothers resident in Ontario and procedures to extraocular muscles on children aged 0–16 years in Ontario hospitals
| Year | Number of live births | Total number of operations on extraocular muscles |
|---|---|---|
| 1982 | 124 856 | |
| 1983 | 126 826 | |
| 1984 | 131 296 | |
| 1985 | 132 208 | |
| 1986 | 133 872 | |
| 1987 | 134 617 | |
| 1988 | 138 066 | |
| 1989 | 145 338 | |
| 1990 | 150 923 | |
| 1991 | 151 478 | |
| 1992 | 150 593 | |
| 1993 | 147 544 | |
| 1994 | 146 839 | 2280 |
| 1995 | 146 036 | 2026 |
| 1996 | 139 846 | 1885 |
| 1997 | 132 799 | 1972 |
| 1998 | 130 789 | 1901 |
| 1999 | 131 083 | 1887 |
| 2000 | 127 741 | 1685 |
| % change 1991 to 2000 | 23 737/151 478 = −15.7% | |
| % change 1994 to 2000 | 595/2280 = −26.1% |