Answer
Yes, the number of people who voted for the CP tripled during Bjelke-Petersen's tenure. Bjelke-Petersen was the premier of Queensland from 1968 to 1987. During his tenure, the CP won the 1972, 1974, 1977, 1980, and 1983 state elections. The CP's vote share increased from 34.8% in 1972 to 45.8% in 1983.