> clearly appears that something significant and non-random happened in the 1970-1972 period
How are you cutting it off that cleanly? How about this: pick a chart and I'll find the data. We can then look at the numbers and see if something significant happened in '71.
The only portion of the graph with divergence around 1971 in the first two graphs is the GDP line. The first graph is even worse -- the divergence is higher in the late 60's than it is in 1971.
How are you cutting it off that cleanly? How about this: pick a chart and I'll find the data. We can then look at the numbers and see if something significant happened in '71.