The difficulty and challenge of winning national Opens

With this week's Lyoness Open powered by Greenfinity being Austria's only Tour event, it is certainly the fifth major for Austrian golfers.  In fact, most golfers will say that their national open or, if their country only stages one event, is their fifth major.  Over the years, homegrown players have found it difficult to win their national opens.  This is due to the immense pressure that both players and fans put on the event, and the difficulty of the golf courses.  Here is a list the national opens on Tour and the success rate of home players:

1. South African Open Championship (Tour event since 1997; South African winners/number of stagings: 12/18; 66%)
2. Hong Kong Open (Tour event since 2002; Hong Kong winners/number of stagings: 0/13; 0%)
3. Maybank Malaysian Open (Tour event since 1999; Malaysian winners/number of stagings: 0/16; 0%)
4. Volvo China Open (Tour event since 2005; Chinese winners/number of stagings: 0/11; 0%)
5. Open de Espana (Tour event since 1972; Spanish winners/number of stagings: 7/43; 16%)
6. Nordea Masters (Tour event since 1991; Swedish winners/number of stagings: 6/24; 25%)
7. Lyoness Open (Tour event since 1990; Austrian winners/number of stagings: 2/15; 13%)
8. U.S. Open (Tour event since 1972; American winners/number of stagings: 31/42; 74%)
9. The Irish Open (Tour event since 1975; Irish winners/number of stagings: 4/39; 10%)
10. Alstom Open de France (Tour event since 1972; French winners/number of stagings: 3/42; 7%)
11. Aberdeen Asset Management Scottish Open (Tour event since 1972; Scottish winners/number of stagings: 1/31; 3%)
12. Open Championship (Tour event since 1972; British winners/number of stagings: 6/42; 14%)
14. M2M Russian Open (Tour event since 2003; Russian winners/number of stagings: 0/7; 0%)
15. Made in Denmark (first year of event)
16. D+D REAL Czech Masters (Tour event since 1994; Czech winners/number of stagings: 0/7; 0%)
17. Italian Open (Tour event since 1972; Italian winners/number of stagings: 3/42; 7%)
18. Omega European Masters (Tour event since 1972; Swiss winners/number of stagings: 0/42; 0%)
19. KLM Open (Tour event since 1972; Dutch winners/number of stagings: 2/42; 5%)
20. ISPS Handa Wales Open (Tour event since 2000; Welsh winners/number of stagings: 0/14; 0%)
21. Portugal Masters (Tour event since 2007; Portuguese winners/number of stagings: 0/7; 0%)
21. Turkish Airlines Open (Tour event since 2013; Turkish winners/number of stagings: 0/1; 0%)

*The European Tour formed in 1972
*This season, Miguel Angel Jimenez won the Open de Espana in his 27th attempt, which represents the only home player to win his national open this season so far.