Table 1.

Description and sources of data.

Data	Period	Description	Source
Population	1900–1970	Official census data (every 10 years)	National Institute of Statistics (INE)
	1970–1985	Annual population estimated by the components method*	INE
	1986–2004	Annual population estimated by the components method*	Catalan Institute of Statistics (IDESCAT)
All-cause mortality	1900–1974	Annual counts	INE
	1975–2004	Annual counts	Catalan Mortality Registry
Breast cancer mortality	1975–2004	Annual counts	Catalan Mortality Registry

*For a detailed description of the component method see reference [8]