|Tramway|Country|City|Height of pylons|Span width, leaning straight line|Span width, horizontal measurement|Height of cable over ground|Year of inauguration|Notes|
|---|---|---|---|---|---|---|---|---|
|Peak 2 Peak Gondola|Canada|Whistler|65m|3024 m|3019 m|436 m|2008|3S Aerial Tramway constructed by Doppelmayr|
|Hut of Regensburg Material Transport Aerial Railway|Austria|Falbeson|?|?|?|430 m|?||
|Vanoise Express|France|Vanoise|none|1850 m|1800 m|380 m|2003||
|Aiguille du Midi|France|Chamonix|none|2867 m|2500 m|?|1955|2nd Section|
|Vallee Blanche Aerial Tramway|France|Mont Blanc|none|2831 m, 1684 m|span is almost horizontal|appr. 300 m|1958|Rock anchored support structure|
|3S Aerial Tramway|Austria|Kitzbühel|0 m, 80m|2507 m|?|400 m|2004||
|Sandia Peak Tramway|USA|Albuquerque|70.7 m, 21.33 m|2353 m|?|274 m|1966||
|Feldmoos-Chli-Titlis Aerial Tramway|Switzerland|Titlis|37.6 m|3476,2 m|?|?|1979|Temp. site tramway, demolished in 1986|

Question: at least how many aerial tramways were inaugurated after 1970?
Answer: 4