## from Muench, Hugo. 1934. 
## Derivation of Rates from Summation Data by the Catalytic Curve. 
## Journal of the American Statistical Association 29, no. 185 (March): 25-38.
## p. 28, Chart 1 "Yellow fever protection tests, interior of Amazonia",
## Taracua, Sao Gabriel and Yaurete, r=3.39% per year
age1 age2 prot
0 5      9.07
5 10     7.04
10 15   23.6
15 20   34.3
20 30    51.9
30 40    90.8
40 50    85.0
50 60    78.1
60 70    100