Logical storage parameters of DBTABLES

Hi Sap All.

just a quick question ,what the field "Size category" under Logical storage parameters of the table in SE11 represents.

when i have a look at the field "Size category" in the Table MARA it has the value of 4 (Data records expected: 15,000 to 63,000) but when i have alook at the number of entries in the table MARA it has the total of 213,576 .

so my question is why it says the size category as "15,000 to 63,000) " as the toral records are 213,576 ,the figures are not mathcing.

any idea on the above question for who ever look at this Q.