dynamic finder > popularity

Hi,

i have popularity table wich has a relationship with the
bookings-destinations. Some destinations are booked more then others.

The popularity table has the columns "primary-key" and a score.

Example

TVC | 6 |
AZO | 4 |
TUO | 3 |
IVC | 1 |
VKO | 1 |
DMM | 1 |

Qeustion: how can i use a dynamic finder...with the purpose "show me the
the top 20 popularity destinations"

Grtz..remco