Number	Year	Gross Income	Price Index	Adjusted Price Index	Real Income
1	2004	60,056	188.9	1.889	31,792
2	2005	61,257	195.3	1.953	31,366
3	2006	62,482	201.6	2.016	30,993
4	2007	63,732	207.3	2.073	30,744
5	2008	65,007	215.3	2.153	30,194
6	2009	66,307	214.5	2.145	30,912
7	2010	67,633	218.1	2.181	31,010
8	2011	68,986	224.9	2.249	30,674
9	2012	70,366	229.6	2.296	30,647
10	2013	71,773	233.0	2.330	30,804
11	2014	73,208	236.7	2.367	30,929
12	2015	74,672	237.0	2.370	31,507
13	2016	76,165	240.0	2.400	31,735
14	2017	77,688	245.1	2.451	31,696
15	2018	79,242	251.1	2.511	31,558
				Total	466,562
				Mean	31,104
				Median	30,993
				Standard Deviation	477.44
				Sample Variance	227,951.01

Explain the meaning of these statistics. And by meaning, I mean what those numbers represent, not the definition. I know what they mean, I want to know what those numbers tell us. Can you help me with that pls?