_id	Year	Median age of mother
1	1995	30
2	1996	30
3	1997	30
4	1998	30
5	1999	31
6	2000	31
7	2001	31
8	2002	31
9	2003	32
10	2004	32
11	2005	32
12	2006	32
13	2007	32
14	2008	32
15	2009	31
16	2010	32
17	2011	31
18	2012	31
19	2013	32
20	2014	32
21	2015	32
22	2016	32
23	2017	32
24	2018	33
25	2019	33
26	2020	33
27	2021	33
28	2022	33
29	2023	33
30	2024	32