What are the Purchase Obligations as a percentage of the total contractual obligations? 
{"Convertible senior notes principal": {"1 year": "$-", "> 5 years": 230000, "Total": 352527}, "Convertible senior notes stated interest": {"1 year": 6591, "> 5 years": 6900, "Total": 32887}, "Operating leases": {"1 year": 7565, "> 5 years": 7659, "Total": 40177}, "Purchase obligations": {"1 year": 39390, "> 5 years": "-", "Total": 39390}, "Total contractual obligations": {"1 year": 53546, "> 5 years": 244559, "Total": 464981}}
purchase_obligations_1_year = df["Purchase obligations"]["1 year"]
total_contractual_obligations_total = df["Total contractual obligations"]["Total"]
answer = (purchase_obligations_1_year / total_contractual_obligations_total) * 100.0