Ages = [0,1,5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100;]
NumberSurviving= [100000,99303,99180,99105,99008,98672,98204,97740,97196,96419,95255,93563,91188,87711,82607,75335,65310,52178,36304,20052,8028,2095;]
Fitted Quadric curve to NumberSurviving*Ages = [0.00057514,-0.18787,14.659,-403.48,1.014e+005;]

For the first time, on the internet, a list of the most common elements, with their abundance in ppm by weight.

O 460000
Si 270000
Al 82000
Fe 63000
Ca 50000
Mg 29000
Na 23000
K 15000
Ti 6600
C 1800

H 1500
Mn 1100
P 1000
F 540
S 420
Sr 360
Ba 340
V 190
Cl 170
Cr 140

Zr 130
Ni 90
Zn 79
Cu 68
Rb 60
Ce 60
La 34
Nd 33
Co 30
Y 29

Sc 26
N 20
Ga 19
Li 17
Nb 17
Ge 14
Pb 10
B 8.7
Pr 8.7
Dy 6.2

Sm 6
Th 6
Gd 5.2
Hf 3.3
Br 3
Er 3
Yb 2.8
Sn 2.2
As 2.1
Be 1.9

Cs 1.9
Eu 1.8
U 1.8 = 53rd most common element in earth's crust
Ta 1.7
Ar 1.5
Ho 1.2
Mo 1.1
W 1.1
Pm 1
From here on ppb
Tb 940

Lu 560
Tl 530
I 490
Tm 450
Sb 200
In 160
Cd 150
Ag 80
Hg 67
Se 50

Pt 37
Bi 25
Pd 6.3
He 5.5
Au 3.1
Ne 3
Re 2.6
Os 1.8
Ru 1
Te 1

Rh .7
Ir .4
Kr .15
Xe .02
Ra .0001
Pa .00001

Data not avaliable for Tc, Po, At, Rn, Fr, Ac