I am not yet perfected, but I am a work in progress getting better each day...

For comparison and credibility sake:

my error:
1871 to 1939 is actually only 68 years
.035% total scale of 1939

your's
68 years of 100 year century is a 32% error, So if passing were to be considered the norm at 70 % your comment would have to be a fail as well.

Now can we get past our own personal faults and examine the issues at hand?