Table:
text: 50 metre rifle prone
World Championships, Men
World Championships, Men
Year_ Place Gold Silver Bronze
1962 Cairo Karl Wenk ( FRG ) Vladimir Chuian ( URS ) James Enoch Hill ( USA )
1966 Wiesbaden David Boyd ( USA ) Jerzy Nowicki ( POL ) Bill Krilling ( USA )
1970 Phoenix Manfred Fiess ( RSA ) Esa Einari Kervinen ( FIN ) Klaus Zaehringer ( FRG )
1974 Thun Karel Bulan ( TCH ) Helge Edvin Anshushaug ( NOR ) Wolfram Waibel Sr. ( AUT )
1978 Seoul Alister Allan ( GBR ) Lones Wigger ( USA ) Lanny Bassham ( USA )

Question: In what year was the last World Championships for men in 50m prone in Thun?