Table 2.

Numbers of malignant neoplasm of breast cases in women under the age of 40.

Age Group	1984–1989	1990–1994	1995–1999	2000–2004	2005–2009	2010–2014	2015–2016
Total number of breast cancer cases	2763	4363	3478	5411	6632	7536	3443
Cases <24 years of age	9	3	7	6	7	8	5
Percentage of cases <24 years of age [%]	0.3	0.07	0.2	0.1	0.1	0.1	0.1
Cases <40 years of age	346	297	257	223	273	402	185
Annual average <40 years of age	58	60	51	45	55	80	92
Percentage of cases <40 years of age [%]	12.5	6.8	7.4	4.1	4.1	5.3	5.4