Calculate GNP and GDP per capita for both years, showing all workings.

$$\text{NFIA} = \text{Overseas income earned by PNG residents} - \text{Income earned in PNG by foreigners}$$

For Year 1:

$$\text{NFIA}_{\text{Year 1}} = \text{K1.5 billion} - \text{K2 billion} = \text{-K0.5 billion}$$

For Year 2:

$$\text{NFIA}_{\text{Year 2}} = \text{K2 billion} - \text{K2.5 billion} = \text{-K0.5 billion}$$

$$\text{GNP} = \text{GDP} + \text{NFIA}$$

For Year 1:

$$\text{GNP}_{\text{Year 1}} = \text{K18 billion} + (\text{-K0.5 billion}) = \text{K17.5 billion}$$

For Year 2:

$$\text{GNP}_{\text{Year 2}} = \text{K22 billion} + (\text{-K0.5 billion}) = \text{K21.5 billion}$$

The GNP for both years are:

• Year 1: $\boxed{\text{K17.5 billion}}$
• Year 2: $\boxed{\text{K21.5 billion}}$

$$\text{GDP per capita} = \frac{\text{GDP}}{\text{Population}}$$

For Year 1:

$$\text{GDP per capita}_{\text{Year 1}} = \frac{\text{K18,000,000,000}}{9,000,000} = \text{K2,000}$$

For Year 2:

$$\text{GDP per capita}_{\text{Year 2}} = \frac{\text{K22,000,000,000}}{9,500,000} \approx \text{K2,315.79}$$

The GDP per capita for both years are:

• Year 1: $\boxed{\text{K2,000}}$
• Year 2: $\boxed{\text{K2,315.79}}$

$$\text{GNP per capita} = \frac{\text{GNP}}{\text{Population}}$$

For Year 1:

$$\text{GNP per capita}_{\text{Year 1}} = \frac{\text{K17,500,000,000}}{9,000,000} \approx \text{K1,944.44}$$

For Year 2:

$$\text{GNP per capita}_{\text{Year 2}} = \frac{\text{K21,500,000,000}}{9,500,000} \approx \text{K2,263.16}$$

The GNP per capita for both years are:

• Year 1: $\boxed{\text{K1,944.44}}$
• Year 2: $\boxed{\text{K2,263.16}}$

• GDP increased from K18 billion (Year 1) to K22 billion (Year 2).
• GNP increased from K17.5 billion (Year 1) to K21.5 billion (Year 2).
• GDP per capita increased from K2,000 (Year 1) to K2,315.79 (Year 2).
• GNP per capita increased from K1,944.44 (Year 1) to K2,263.16 (Year 2).

Yes, PNG has achieved $\boxed{\text{economic growth}}$. This is justified by the increase in both its total GDP and GNP, as well as its GDP per capita and GNP per capita, from Year 1 to Year 2. All key indicators of economic output and average individual income show an upward trend.