Table:
text: Canada Post stamp releases (2010–14)
2010
2010
Date_of_Issue Theme Denomination Design Illustration Quantity Printing_Process Paper_Type First_Day_Cover_Cancellation
June 18 Rotary International : 100 Years in Canada 57 cents Xerxes Irani Beau Lark 2000000 Litho in 6 cols plus varnish Tullis Montreal
July 2 Art Canada: Prudence Heward 57 cents Helene L’Heureux Helene L’Heureux 1500000 Litho in 7 colours Tullis Montreal
July 5 Roadside Attractions: Coffee Pot 57 cents Fraser Ross Bonnie Ross 3880000 Litho in 8 cols plus varnish Tullis Davidson, SK
July 5 Roadside Attractions: Happy Rock 57 cents Fraser Ross Bonnie Ross 3880000 Litho in 8 cols plus varnish Tullis Davidson, SK
July 5 Roadside Attractions: Puffin 57 cents Fraser Ross Bonnie Ross 3880000 Litho in 8 cols plus varnish Tullis Davidson, SK

Question: How often is the theme of Canada Post stamp releases (2010–14) Rotary International: 100 Years in Canada?