“Trends to cancer incidence:

In recent years, breast cancer incidence rates have increased by 1% per year. The rise has been a little faster in women younger than 50 (1.4%). This is probably due to younger women being more likely to have certain factors that increase risk, such as having excess body weight, having fewer children, or having a first child after age 30.”

American Cancer Society  (Key Statistics for Breast Cancer | American Cancer Society)