Java driver composite columns

Consider the following java pojo as a representation of a composite column.

public static class Population {
		
	@Component(ordinal=0) String state;
	@Component(ordinal=1) String city;
	@Component(ordinal=2) Integer zipcode;
		
	public Population() {
	}

	public Population(String state, String city, Integer zipcode) {
		this.state = state;
		this.city = city;
		this.zipcode = zipcode;
	}

	public String toString() {
		return "Population [" + state + ", " + city + ", " + zipcode + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((state == null) ? 0 : state.hashCode());
		result = prime * result + ((city == null) ? 0 : city.hashCode());
		result = prime * result + ((zipcode == null) ? 0 : zipcode.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) return true;
		if (obj == null)return false;
		if (getClass() != obj.getClass()) return false;
		Population other = (Population) obj;
		boolean equal = true;
		equal &= (state != null) ? (state.equals(other.state)) : other.state == null; 
		equal &= (city != null) ? (city.equals(other.city)) : other.city == null; 
		equal &= (zipcode != null) ? (zipcode.equals(other.zipcode)) : other.zipcode == null;
		return equal;
	}
		
	public Population clone() {
		return new Population(state, city, zipcode);
	}
}	

Say that we want to tabulate the population for various cities for various years. Consider the year as the row key. And each composite column is the city, and the column name is it's population for that year.

Consider this schema

Consider these rows for the years 2011 - 2014