Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Artist | Country of origin | Period active | Release-year of first charted record | Genre | Claimed sales |
| --- | --- | --- | --- | --- | --- |
| Mariah Carey | United States | 1988–present | 1990.0 | R&B / Pop / Rock | 200 million 175 million |
| Celine Dion | Canada | 1981–present | 1981.0 | Pop | 200 million 175 million |
| Whitney Houston | United States | 1977–2011 | 1984.0 | R&B / Pop | 200 million 170 million |
| AC/DC | Australia | 1973–present | 1975.0 | Hard rock / Heavy metal | 200 million 150 million |
| Queen | United Kingdom | 1971–present | 1973.0 | Rock | 200 million 150 million |
| The Rolling Stones | United Kingdom | 1962–present | 1963.0 | Rock / Blues rock | 200 million |
| ABBA | Sweden | 1972–1982 | 1972.0 | Pop / Disco | 200 million 100 million |
Question:
What was the active period for the pop genre?
Answer:
1981–present