Step 1: Gather base data.
From the graphs:
- 2004: Assets = 100, Sales/Asset = 0.6 ⇒ Sales = 60, CSR% of sales = 1.67% ⇒ CSR = 1.0.
- 2005: Assets = 110, Sales/Asset = 0.5 ⇒ Sales = 55, CSR% = 2.09% ⇒ CSR ≈ 1.15.
- 2006: Assets = 125, Sales/Asset = 0.64 ⇒ Sales = 80, CSR% = 2.5% ⇒ CSR = 2.0.
- 2007: Assets = 135, Sales/Asset = 0.67 ⇒ Sales = 90, CSR% = 2.22% ⇒ CSR = 2.0.
- 2008: Assets = 150, Sales/Asset = 0.8 ⇒ Sales = 120, CSR% = 2.08% ⇒ CSR = 2.5.
- 2009: Assets = 160, Sales/Asset = 1.25 ⇒ Sales = 200, CSR% = 1.58% ⇒ CSR = 3.16.
Step 2: Compute year-on-year increase in CSR spending.
- 2005 vs 2004: 1.15 – 1.0 = 0.15.
- 2006 vs 2005: 2.0 – 1.15 = 0.85.
- 2007 vs 2006: 2.0 – 2.0 = 0.0.
- 2008 vs 2007: 2.5 – 2.0 = 0.5.
- 2009 vs 2008: 3.16 – 2.5 = 0.66.
Step 3: Identify maximum increase.
The biggest jump is in 2006 (increase of 0.85).
\[
\boxed{\text{2006}}
\]