Domen
Misico dux Vandalorum
I note that it should be no surprise that after more than 20 years of autocracy and paying to Nazi Germany and Fascist (later Democratic) Italy, opening to the Western World and promoting industry and development, as well as welcoming tourism with open arms, would imply a huge boom in Spanish economy.
Nope.
Franco really dimnished the economic development gap between Spain and Western Europe.
Compare the ratio (in percentage) of GDP per capita (PPP) of Spain to that of Britain, France, Germany (average from these three) in 1935. Then compare the ratio (in percentage) of GDP per capita (PPP) of Spain to that of Britain, France, Germany (average) in 1976. You will see the difference.
You will see that it was not only development (economic development is taking place all the time, even when leaders are very incompetent, unless there is some total catastrophy - like the one which only recently takes place in Spain, since 2007), but it was fast development - "chasing the West".
By comparison, Poland increased its economic development gap between 1939 and 1989, compared to the West - i.e. Western Europe's economy was growing faster in period 1939 - 1989 than Polish economy (even though undoubtedly Polish economy was growing during the Communist Era of 1945 - 1989).
On the other hand, Spanish economy in period 1955 - 1975 was growing faster than British, German, French economy.
So you should be happy for Franco - he was still better than the Communists on this side of the Iron Curtain.