over cards

below is some info i've collected on over cards,
as a general rule of thumb for non gifted in math (me)
is this chart a good over all to remeber
reguardless of # players
or if not, then what about 6 or 9 players
or what would be good over all % to remeber
chance of at least one over card coming on the;
you---flop---trn.& riv. combined
kk-----23%------17%
qq-----41%------32%
jj-----57%------45%
1010---69%------57%
99-----79%------68%
88-----87%------77%
the % for turn river separtae are not really nessecary
but would be really to have. thanks.