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How is Homeland/Occupation/Cult skills calculated?

I was bored today and decided to look further in the core rulebook and got curious since I saw some of the homelands/occupations/cults had more skills combined(Like 20%+15%+10% is 45).
So is there a  specific way of calculating skills for Homelands, occupations or cults?

These were some of the differences I have found.

Ignoring Customs and speaking their own language, this is the homeland skills combined:

• Sartar has 75 in Cultural Skills and 90 in Cultural Weapons. Total: 165
• Esrolia has 90 in Cultural Skills and 95 in Cultural Weapons.Total: 185
• Grazelands has 95 in Cultural Skills and 75 in Cultural Weapons.Total: 170
• Lunar Tarsh has 85 in Cultural Skills and 80 in Cultural Weapons.Total:165
• Old Tarsh has 65 in Cultural Skills and 90 in Cultural Weapons.Total:155
• Prax has the same cultural skills with 120 but has differences in Cultural Weapons.

Prax Cultural Weapons:

• Bison Rider:55 
• High Llama Rider:45
• Impala Rider:55
• Pol-Joni:60
• Sable Rider:50

I didn’t count all occupations:

• Entertainer: 175
• Fisher: 130.
• Thief:175.
• Merchant: 170
• Hunter: 140

warriors:

• Heavy Infantry:165
• Light Infantry: 195
• Heavy Cavalry: 200
• Light Cavalry: 200

Ignoring the Bonus they get to other skills and Cult Lore (deity) , Worship (deity) , Meditate

• Argan Argar: 45
• Babeester Gor: 55
• Chalana Arroy: 45
• Daka Fal: 45
• Eiritha: 45
• Engizi:45
• Ernalda: 65
• Humakt: 45
• Issaries: 45
• Lhankor Mhy: 45
• Maran Gor: 60
• Odayla: 45
• Orlanth:55
• Seven Mothers: 45
• Storm Bull: 45
• Waha: 45
• Yelm: 50
• Yelmalio: 45
• Yinkin: 35