Tar yield (mg) | Number of brands tested | |||||||
---|---|---|---|---|---|---|---|---|
1 | 2 | 3–4 | 5–8 | 9–12 | 13–16 | >16 | ||
*Figures rounded to nearest whole number. | ||||||||
1968 | – | – | – | 8 | – | 12 | 80 | 25 |
1969 | – | – | – | 6 | – | 9 | 85 | 34 |
1971 | – | – | – | 5 | 4 | 46 | 45 | 55 |
1972 | – | – | – | 6 | 13 | 57 | 24 | 53 |
1974 | – | – | – | 7 | 11 | 51 | 31 | 61 |
1975 | – | – | – | 13 | 29 | 47 | 11 | 31 |
1977 | – | – | – | 5 | 19 | 51 | 25 | 85 |
1978 | – | – | – | 4 | 21 | 50 | 25 | 96 |
1980 | 1 | 1 | – | 11 | 23 | 48 | 16 | 103 |
1984 | 1 | – | 2 | 10 | 50 | 37 | – | 133 |
1986 | 1 | 1 | 2 | 26 | 59 | 11 | – | 129 |
1988 | 1 | 3 | 7 | 27 | 53 | 9 | – | 159 |
1991 | 1 | 6 | 17 | 27 | 44 | 5 | – | 150 |