This question runs in a pre-configured Salesforce environment - no personal connection required.
Count how many Accounts exist for each unique BillingCountry value. Return a Map where the key is the country name and the value is the count of accounts. Include countries with null or empty billing country as 'Unknown'.
Examples:
Map<String, Integer> distribution = getAccountCountryDistribution();
// Results: {'United States' => 15, 'Canada' => 8, 'Unknown' => 3}
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