Appendix 3.
Level III studies broken down by country and year.
| Year | Total | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1980 | 1985 | 1990 | 1995 | 2000 | 2005 | 2010 | |||
| Country | Canada | 0 | 1 | 1 | 1 | 2 | 1 | 2 | 8 |
| China | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | |
| Collaborative | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 2 | |
| Denmark | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | |
| Finland | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 2 | |
| France | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | |
| Germany | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | |
| Italy | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 2 | |
| Japan | 0 | 0 | 2 | 1 | 1 | 1 | 1 | 6 | |
| Netherlands | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | |
| Norway | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 | |
| South Korea | 0 | 0 | 0 | 0 | 1 | 2 | 2 | 5 | |
| Sweden | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 2 | |
| Switzerland | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 2 | |
| Taiwan | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 | |
| UK | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | |
| USA | 9 | 11 | 15 | 12 | 13 | 19 | 15 | 94 | |
| Total | 10 | 14 | 19 | 16 | 20 | 28 | 31 | 138 |