The statistics are from the Lingüística corpus

clave: 32
Sense: Not a marker: 14
Fran, 7
Margarita, 7
Sense: Importante, esencial: 18
Fran, 1
Elena, 5
Margarita, 12
claves: 8
Sense: Not a marker: 6
Fran, 1
Elena, 2
Margarita, 3
Sense: Importante, esencial: 2
Margarita, 1
Elena, 1